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Investigation of
chimney subsidence over a salt mine
L.M.Zakharova1*,
O.V.Chesnokova1, O.Y. Pidgurna2, V.V. Nazimko1,
1Institute for
Physics of Mining Processes NAS, Dnipro, Ukraine
2 Donetsk National
Technical University, Pokrovs’k, Ukraine
*Corresponding
author: mila2017ma@gmail.com
Physical and
technical problems of mining production, 2020, (22), 57-76.
https://doi.org/10.37101/ftpgp22.01.005
full
text (pdf)
ABSTRACT
Purpose. Investigation of
ground movement around an abandoned salt mine during sewage dissemination
underground. Identification of dissipative structures during chimney
subsidence initiation.
Methods. We used FLAC3D
program package to simulate stress-strain redistribution and irreversible
ground movement during the ground subsidence activation.
Findings. Initiation of
ground movement mobilization started not from the surface but at a certain
depth where the irreversible ground movement emerges. Laying and hanging
wings of a geological fault became to move relatively each other over an
abandoned salt mine. Dissipative structures emerged in form of abrupt
intensive variation of cluster mosaic in the field of movement that follows
the ground mobilization. Concord displacement of the adjacent ground
clusters changes to their conflicting movement and vice versa. Such a
periodical sequential shifting induces destruction of pillars and
surrounding rock mass, disintegration of the fractured bodies and their
asynchronous movement relatively each other and, as result, chimney
subsidence initiation at the surface.
Originality. It was the first
time when periodic cluster structures were registered
during chimney subsidence activation. Dissipative structures manifest as
shifting of irreversible torrents and rotors, which replace each other
promoting progress of the irreversible ground movement and facilitating
development of the chimney. Computer simulation assisted to understand
complex irreversible behavior of ground during
its irreversible movement triggered by change of physical properties of the
ground under dampening. We proposed innovative measures for preventing
development of dissipative structures.
Practical
implications. The results of simulation allowed proposing effective measures,
which are founded on restrictions of degree of
freedom and suppress of the dissipative structures development.
Keywords: rock mass,
irreversible ground movement, ground destruction, simulation, FLAC3D,
dissipative structures.
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